1 files changed, 336 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c
new file mode 100644
index 00000000000..a50958b1b6e
--- /dev/null
+++ b/drivers/scsi/scsi_proc.c
@@ -0,0 +1,336 @@
+/*
+ * linux/drivers/scsi/scsi_proc.c
+ *
+ * The functions in this file provide an interface between
+ * the PROC file system and the SCSI device drivers
+ * It is mainly used for debugging, statistics and to pass 
+ * information directly to the lowlevel driver.
+ *
+ * (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de 
+ * Version: 0.99.8   last change: 95/09/13
+ * 
+ * generic command parser provided by: 
+ * Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>
+ *
+ * generic_proc_info() support of xxxx_info() by:
+ * Michael A. Griffith <grif@acm.org>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/proc_fs.h>
+#include <linux/errno.h>
+#include <linux/blkdev.h>
+#include <linux/seq_file.h>
+#include <asm/uaccess.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+
+#include "scsi_priv.h"
+#include "scsi_logging.h"
+
+
+/* 4K page size, but our output routines, use some slack for overruns */
+#define PROC_BLOCK_SIZE (3*1024)
+
+static struct proc_dir_entry *proc_scsi;
+
+/* Protect sht->present and sht->proc_dir */
+static DECLARE_MUTEX(global_host_template_sem);
+
+static int proc_scsi_read(char *buffer, char **start, off_t offset,
+			  int length, int *eof, void *data)
+{
+	struct Scsi_Host *shost = data;
+	int n;
+
+	n = shost->hostt->proc_info(shost, buffer, start, offset, length, 0);
+	*eof = (n < length);
+
+	return n;
+}
+
+static int proc_scsi_write_proc(struct file *file, const char __user *buf,
+                           unsigned long count, void *data)
+{
+	struct Scsi_Host *shost = data;
+	ssize_t ret = -ENOMEM;
+	char *page;
+	char *start;
+    
+	if (count > PROC_BLOCK_SIZE)
+		return -EOVERFLOW;
+
+	page = (char *)__get_free_page(GFP_KERNEL);
+	if (page) {
+		ret = -EFAULT;
+		if (copy_from_user(page, buf, count))
+			goto out;
+		ret = shost->hostt->proc_info(shost, page, &start, 0, count, 1);
+	}
+out:
+	free_page((unsigned long)page);
+	return ret;
+}
+
+void scsi_proc_hostdir_add(struct scsi_host_template *sht)
+{
+	if (!sht->proc_info)
+		return;
+
+	down(&global_host_template_sem);
+	if (!sht->present++) {
+		sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi);
+        	if (!sht->proc_dir)
+			printk(KERN_ERR "%s: proc_mkdir failed for %s\n",
+			       __FUNCTION__, sht->proc_name);
+		else
+			sht->proc_dir->owner = sht->module;
+	}
+	up(&global_host_template_sem);
+}
+
+void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
+{
+	if (!sht->proc_info)
+		return;
+
+	down(&global_host_template_sem);
+	if (!--sht->present && sht->proc_dir) {
+		remove_proc_entry(sht->proc_name, proc_scsi);
+		sht->proc_dir = NULL;
+	}
+	up(&global_host_template_sem);
+}
+
+void scsi_proc_host_add(struct Scsi_Host *shost)
+{
+	struct scsi_host_template *sht = shost->hostt;
+	struct proc_dir_entry *p;
+	char name[10];
+
+	if (!sht->proc_dir)
+		return;
+
+	sprintf(name,"%d", shost->host_no);
+	p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
+			sht->proc_dir, proc_scsi_read, shost);
+	if (!p) {
+		printk(KERN_ERR "%s: Failed to register host %d in"
+		       "%s\n", __FUNCTION__, shost->host_no,
+		       sht->proc_name);
+		return;
+	} 
+
+	p->write_proc = proc_scsi_write_proc;
+	p->owner = sht->module;
+}
+
+void scsi_proc_host_rm(struct Scsi_Host *shost)
+{
+	char name[10];
+
+	if (!shost->hostt->proc_dir)
+		return;
+
+	sprintf(name,"%d", shost->host_no);
+	remove_proc_entry(name, shost->hostt->proc_dir);
+}
+
+static int proc_print_scsidevice(struct device *dev, void *data)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct seq_file *s = data;
+	int i;
+
+	seq_printf(s,
+		"Host: scsi%d Channel: %02d Id: %02d Lun: %02d\n  Vendor: ",
+		sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
+	for (i = 0; i < 8; i++) {
+		if (sdev->vendor[i] >= 0x20)
+			seq_printf(s, "%c", sdev->vendor[i]);
+		else
+			seq_printf(s, " ");
+	}
+
+	seq_printf(s, " Model: ");
+	for (i = 0; i < 16; i++) {
+		if (sdev->model[i] >= 0x20)
+			seq_printf(s, "%c", sdev->model[i]);
+		else
+			seq_printf(s, " ");
+	}
+
+	seq_printf(s, " Rev: ");
+	for (i = 0; i < 4; i++) {
+		if (sdev->rev[i] >= 0x20)
+			seq_printf(s, "%c", sdev->rev[i]);
+		else
+			seq_printf(s, " ");
+	}
+
+	seq_printf(s, "\n");
+
+	seq_printf(s, "  Type:   %s ",
+		     sdev->type < MAX_SCSI_DEVICE_CODE ?
+	       scsi_device_types[(int) sdev->type] : "Unknown          ");
+	seq_printf(s, "               ANSI"
+		     " SCSI revision: %02x", (sdev->scsi_level - 1) ?
+		     sdev->scsi_level - 1 : 1);
+	if (sdev->scsi_level == 2)
+		seq_printf(s, " CCS\n");
+	else
+		seq_printf(s, "\n");
+
+	return 0;
+}
+
+static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
+{
+	struct Scsi_Host *shost;
+	int error = -ENXIO;
+
+	shost = scsi_host_lookup(host);
+	if (IS_ERR(shost))
+		return PTR_ERR(shost);
+
+	error = scsi_scan_host_selected(shost, channel, id, lun, 1);
+	scsi_host_put(shost);
+	return error;
+}
+
+static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
+{
+	struct scsi_device *sdev;
+	struct Scsi_Host *shost;
+	int error = -ENXIO;
+
+	shost = scsi_host_lookup(host);
+	if (IS_ERR(shost))
+		return PTR_ERR(shost);
+	sdev = scsi_device_lookup(shost, channel, id, lun);
+	if (sdev) {
+		scsi_remove_device(sdev);
+		scsi_device_put(sdev);
+		error = 0;
+	}
+
+	scsi_host_put(shost);
+	return error;
+}
+
+static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
+			       size_t length, loff_t *ppos)
+{
+	int host, channel, id, lun;
+	char *buffer, *p;
+	int err;
+
+	if (!buf || length > PAGE_SIZE)
+		return -EINVAL;
+
+	buffer = (char *)__get_free_page(GFP_KERNEL);
+	if (!buffer)
+		return -ENOMEM;
+
+	err = -EFAULT;
+	if (copy_from_user(buffer, buf, length))
+		goto out;
+
+	err = -EINVAL;
+	if (length < PAGE_SIZE)
+		buffer[length] = '\0';
+	else if (buffer[PAGE_SIZE-1])
+		goto out;
+
+	/*
+	 * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
+	 * with  "0 1 2 3" replaced by your "Host Channel Id Lun".
+	 */
+	if (!strncmp("scsi add-single-device", buffer, 22)) {
+		p = buffer + 23;
+
+		host = simple_strtoul(p, &p, 0);
+		channel = simple_strtoul(p + 1, &p, 0);
+		id = simple_strtoul(p + 1, &p, 0);
+		lun = simple_strtoul(p + 1, &p, 0);
+
+		err = scsi_add_single_device(host, channel, id, lun);
+		if (err >= 0)
+			err = length;
+
+	/*
+	 * Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
+	 * with  "0 1 2 3" replaced by your "Host Channel Id Lun".
+	 */
+	} else if (!strncmp("scsi remove-single-device", buffer, 25)) {
+		p = buffer + 26;
+
+		host = simple_strtoul(p, &p, 0);
+		channel = simple_strtoul(p + 1, &p, 0);
+		id = simple_strtoul(p + 1, &p, 0);
+		lun = simple_strtoul(p + 1, &p, 0);
+
+		err = scsi_remove_single_device(host, channel, id, lun);
+	}
+
+ out:
+	free_page((unsigned long)buffer);
+	return err;
+}
+
+static int proc_scsi_show(struct seq_file *s, void *p)
+{
+	seq_printf(s, "Attached devices:\n");
+	bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice);
+	return 0;
+}
+
+static int proc_scsi_open(struct inode *inode, struct file *file)
+{
+	/*
+	 * We don't really needs this for the write case but it doesn't
+	 * harm either.
+	 */
+	return single_open(file, proc_scsi_show, NULL);
+}
+
+static struct file_operations proc_scsi_operations = {
+	.open		= proc_scsi_open,
+	.read		= seq_read,
+	.write		= proc_scsi_write,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+int __init scsi_init_procfs(void)
+{
+	struct proc_dir_entry *pde;
+
+	proc_scsi = proc_mkdir("scsi", NULL);
+	if (!proc_scsi)
+		goto err1;
+
+	pde = create_proc_entry("scsi/scsi", 0, NULL);
+	if (!pde)
+		goto err2;
+	pde->proc_fops = &proc_scsi_operations;
+
+	return 0;
+
+err2:
+	remove_proc_entry("scsi", NULL);
+err1:
+	return -ENOMEM;
+}
+
+void scsi_exit_procfs(void)
+{
+	remove_proc_entry("scsi/scsi", NULL);
+	remove_proc_entry("scsi", NULL);
+}